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Xuzhou Ouke Instrument Co., Ltd.

Magnetic Flow Meter, Electromagnetic Flow Meter, Water Flow Meter manufacturer / supplier in China, offering High Precision Orifice Flow Measurement Throttle Device, High Quality Self Feed Bit for Drilling Wood, Diamond Hole Saw for Drilling Marble and so on.

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High Precision Orifice Flow Measurement Throttle Device

FOB Price: Get Latest Price
Min. Order: 1 Piece
Port: Shanghai, China
Production Capacity: 5, 000, 00PCS/Year
Payment Terms: T/T, Western Union, Paypal

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Basic Info
  • Model NO.: LG
  • Structure Type: Karman Vortex
  • Output Signal Type: Digital Type
  • Material: Metal
  • IP Rating: IP67
  • Customized: Customized
  • Usage: Liquid Level Sensor
  • Trademark: ouke
  • Specification: CE
  • HS Code: 9026100000
  • Type: Flow Meter
  • Measuring Medium: Liquid
  • Production Process: SemiConductor Integrated
  • Accuracy Grade: 1.0% Fs (Diameter of Dn15 and Dn 20 Is 2.0% Fs)
  • Certification: CE
  • Output: Two Wires,4 to 20mA DC+ Hart
  • Theory: Faraday′s Law of Electromagnetic Induction
  • Transport Package: Carton
  • Origin: China
Product Description


Throttle device is the most historic and most extensively used flow measurement instrument. 

Orifice Flow Measurement Throttle Device


Throttle device is the most historic and most extensively used flow measurement instrument. Its features are simple
structure, easy installation, stable performance and high accuracy, etc merits. It can be used for flow measurement
for liquid, steam and gas in modern industries. There are many kinds of throttle devices with a whole variety (being
conformability with Standard GB/T2624-2006, Standard ISO5167-1-20031, Standard BS1042-1989 and Standard
ASME) that are manufactured with advanced calculation methods and precise manufacturing means. They are
applied extensively in petroleum, chemical, power, light industry, water supply field, gas transmission field etc.

Principle of operation

A throttle element (like throttle orifice, throttle nozzle, etc) is installed in a pipe that is full of one way flowing continuous fluid. When the fluid passes the throttling orifice of the throttling element, the fluid stream forms local shrink. Then the velocity increases, so does the kinetic energy, the static pressure decreases. So, there is a differential static pressure from the fore and the rear of the throttle element, i.e. P=P1-P2. If the area of the throttle orifice is F, the mass flow of the fluid is qm, the volume flow is qv the density is ρ, then according to the flow continuity law and Bernoulli equation, the following mathematical relations between differential pressure and fluid flow can be derived:

                                  qm=αF  or qv=αF 

"α" is flow coefficient. According to the above equation, if the area of the throttle orifice and fluid density are constant, flow has direct ratio with square root of differential pressure. That is to say, if you have the differential pressure value, then you can calculate the flow value. Throttle device can measuring fluid flow just according to this principle.

Table 1 Throttling element code and meaning
YStandard orifice plateIEccentric orifice plate
Q1/4 circle orifice plateSSegmental orifice plate
XSmall caliber orifice plateZRaw cast contracted section (throat) Classic Wenturi Tube
TTaper inlet orifice plateJMachined contracted section (throat) Classic Wenturi Tube
MISA1932 ejection nozzleHIron plate welded contracted section (throat) Classic Wenturi Tube
CMajor diameter ejection nozzleWWenturi ejection nozzle
Table 2 Pressure measuring code and meaning
MeaningPressure measuring with flangePressure measuring with angle joint ring chamberPressure measuring with drilling holePressure measuring with two distanced holesSpecial pressure measuring
Table 3 Nominal diameter code and meaning
in 1/23/411-1/41-1/222-1/234
Table 4 Nominal pressure code and meaning
Class 150  300  600900 
Class 15002500       
High Precision Orifice Flow Measurement Throttle Device
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